L1 charging adds about 1 kWh to the battery for each full hour of charging. With freeway driving and climate control use, 3 miles per kWh is a reasonable energy consumption value. Therefore, 8 hours of charging is good for about 24 miles of driving. I prefer to round down when offering recommendations to make sure potential EV drivers understand the limitations of L1 charging.

I prefer to round down when offering recommendations to make sure potential EV drivers understand the limitations of L1 charging.

There's 'rounding down' and there's 'being an alarmist.' You wrote that anyone driving more than 20 miles a day needs L-2 charging. That just isn't true. If you want to tell people who want or need to drive at 70+ MPH that they need L-2 for that driving, feel free.